Im having some issues downshifting from overdrive every time i pass somebody on the highway, just some rattling sound nothing really major but in the past few months its been getting louder, im being told by some mechanics that it needs an oil change because the oil now its too thin for the torque converter to downshift, my question is, has anybody done an oil change on this year model? If so what oil its supposed to be used? And does this transmission comes with an oil filter? Any help greatly appreciated, thanx guys!